$(function (){
    $('#username').on('blur',function (){
        $.ajax({
            type        :"GET",
            url         :"signonUsernameExist?username="+this.value,
            success     :function (data){
                console.log(data);
                if(data.SignOnInform === "Exist"){
                    $('#usernameTips').attr("class","okTips").text('Exist');
                }else {
                    $('#usernameTips').attr("class","errorTips").text('Not Exist');
                }
            }
        });
    });
});